r174545 - Become a little smarter with formatting long chains of pipes.

[Daniel Jasper]

Author: djasper
Date: Wed Feb  6 15:04:05 2013
New Revision: 174545

URL: http://llvm.org/viewvc/llvm-project?rev=174545&view=rev
Log:
Become a little smarter with formatting long chains of pipes.

Assign a high penalty to breaking before "<<" if the previous token is a
string literal ending in ":" or "=".

Before:
llvm::outs()
    << "aaaaaaaaaaaaaaaaa = " << aaaaaaaaaaaaaaaaa << "bbbbbbbbbbbbbbbbb = "
    << bbbbbbbbbbbbbbbbb << "ccccccccccccccccc = " << ccccccccccccccccc
    << "ddddddddddddddddd = " << ddddddddddddddddd << "eeeeeeeeeeeeeeeee = "
    << eeeeeeeeeeeeeeeee;

After:
llvm::outs() << "aaaaaaaaaaaaaaaaa = " << aaaaaaaaaaaaaaaaa
             << "bbbbbbbbbbbbbbbbb = " << bbbbbbbbbbbbbbbbb
             << "ccccccccccccccccc = " << ccccccccccccccccc
             << "ddddddddddddddddd = " << ddddddddddddddddd
             << "eeeeeeeeeeeeeeeee = " << eeeeeeeeeeeeeeeee;

Modified:
    cfe/trunk/lib/Format/TokenAnnotator.cpp
    cfe/trunk/unittests/Format/FormatTest.cpp

Modified: cfe/trunk/lib/Format/TokenAnnotator.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Format/TokenAnnotator.cpp?rev=174545&r1=174544&r2=174545&view=diff
==============================================================================
--- cfe/trunk/lib/Format/TokenAnnotator.cpp (original)
+++ cfe/trunk/lib/Format/TokenAnnotator.cpp Wed Feb  6 15:04:05 2013
@@ -784,8 +784,16 @@ unsigned TokenAnnotator::splitPenalty(co
       Left.Type == TT_TemplateOpener)
     return 20;
 
-  if (Right.is(tok::lessless))
+  if (Right.is(tok::lessless)) {
+    if (Left.is(tok::string_literal)) {
+      char LastChar =
+          StringRef(Left.FormatTok.Tok.getLiteralData(),
+                    Left.FormatTok.TokenLength).drop_back(1).rtrim().back();
+      if (LastChar == ':' || LastChar == '=')
+        return 100;
+    }
     return prec::Shift;
+  }
   if (Left.Type == TT_ConditionalExpr)
     return prec::Assignment;
   prec::Level Level = getPrecedence(Left);

Modified: cfe/trunk/unittests/Format/FormatTest.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/unittests/Format/FormatTest.cpp?rev=174545&r1=174544&r2=174545&view=diff
==============================================================================
--- cfe/trunk/unittests/Format/FormatTest.cpp (original)
+++ cfe/trunk/unittests/Format/FormatTest.cpp Wed Feb  6 15:04:05 2013
@@ -1318,6 +1318,13 @@ TEST_F(FormatTest, AlignsPipes) {
                "           << \"  cccccc = \" << pkt.cccccc << \"\\n\"\n"
                "           << \"  ddd = [\" << pkt.ddd << \"]\\n\"\n"
                "           << \"}\";");
+
+  verifyFormat(
+      "llvm::outs() << \"aaaaaaaaaaaaaaaaa = \" << aaaaaaaaaaaaaaaaa\n"
+      "             << \"bbbbbbbbbbbbbbbbb = \" << bbbbbbbbbbbbbbbbb\n"
+      "             << \"ccccccccccccccccc = \" << ccccccccccccccccc\n"
+      "             << \"ddddddddddddddddd = \" << ddddddddddddddddd\n"
+      "             << \"eeeeeeeeeeeeeeeee = \" << eeeeeeeeeeeeeeeee;");
 }
 
 TEST_F(FormatTest, UnderstandsEquals) {